[Linux-aus] 30TB backup

[John Mann]

On 29 June 2015 at 12:04, Russell Coker <russell at coker.com.au> wrote:

> What's the best way of backing up 30TB of data?
>
> ...
>
> The 2 servers with ZFS pools are connected by GigE, which really isn't
> suitable for backing up 15TB of data.


You might be surprised.

Reading metadata, head seeks, rotation etc slows things down.
Often, file transfers are limited to single disk spindle read rates
i.e. ~ 100 MB/s or ~ 1 Gbit/s

_If_ you can keep a 1 Gbit/s Ethernet link full, it can transfer 10 TB per
day.
See http://techinternets.com/copy_calc

15 TB in < 2 days isn't too long to wait for the initial backup.

Thanks,
     John
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